Hello there folks,
I am repairing a friends Yamaha active subwoofer. The amplifier module (CHIP) is a 60 watt Sanyo STK device.
The maximum operational thermal rating = 125 degrees Celsius.
With no cooling fins, the sub. design uses only the sheet metal of the control panel for cooling.
I am fairly sure the reason the Chip Amp/module blew-up was heavy drive at high temperature.
There is room close to the Chip Amp/module for me to add a 240V thermal switch.
My local electronics shop has a 100 deg. C thermal switch.
My question is >
Is 100 deg. too low, too high or just right for such an aplication ???
I am repairing a friends Yamaha active subwoofer. The amplifier module (CHIP) is a 60 watt Sanyo STK device.
The maximum operational thermal rating = 125 degrees Celsius.
With no cooling fins, the sub. design uses only the sheet metal of the control panel for cooling.
I am fairly sure the reason the Chip Amp/module blew-up was heavy drive at high temperature.
There is room close to the Chip Amp/module for me to add a 240V thermal switch.
My local electronics shop has a 100 deg. C thermal switch.
My question is >
Is 100 deg. too low, too high or just right for such an aplication ???
Thank you for your post.
For an extra $20 I will be recommending to my friend the addition of a 'proper finned heatsink' added to the
outside of the 'sheet metal control panel'. I think this will require stripping the black paint back to metal + transfer compound.
I also have the choice of both 70 & 90 degree thermal switches locally.
Cheers
For an extra $20 I will be recommending to my friend the addition of a 'proper finned heatsink' added to the
outside of the 'sheet metal control panel'. I think this will require stripping the black paint back to metal + transfer compound.
I also have the choice of both 70 & 90 degree thermal switches locally.
Cheers
Other types of Chip Amps have thermal/current limiting built into design. Some are even output short circuit protected.
Why would a company as large as Yamaha choose such a device ???
( at least there is a DC protection relay circuit incorporated )
Would it make more sense instead of repairing and modifying the existing amp to just replace it with something actually designed for that application?
ICEpower 100AS1 Class D Amplifier
Mike
ICEpower 100AS1 Class D Amplifier
Mike
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